Scaffold-jack.



N. WILLIAMS. SGAPFOLD JACK. APPLICATION FILED SEPT. 19, 1911.

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N. WILLIAMS. SOAFFOLD JACK. APPLICATION FILED SBPT.19, 1911.

Patented Jan. 14, 1913.

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' INVENTOR WITNESSES v fay W1; 0217 QJQ 5 Q NATHANIEL WILLIAMS, OF OWOSSO, MICHIGAN.

SGAFFOLD-J'ACK.

Specification of Letters Patent.

Patented Jan. 14, 1913.

Application filed September 19, 1911. Serial No. 650,135.

To all whom it may concern Be it known that I, NATHANIEL VVIL- LIAMS, a citizen of the United States, residing at Owosso, in the county of Shiawassee and State of Michigan, have invented certain new and useful Improvements in Scaffold Jacks, of which the following is a specification.

My invention relates to improvements in scaffold jacks and refers particularly to a jack for use interiorly and exteriorly upon:

a building.

One object of my invention is the prowill be adjustable vision of a jack which upon a ladder or other suitable support.

vision of a jack justably supported plunger thereon for use in cornice work and the like.

ble scaffold support for use in connectioni j regular intervals, and a series of openings Other objects of the invention are the provision of a device of the character statedf, construc-; tion; capable of use in various places and; which will combine safety and perfectsecurity in operation@ with lightness and compactness, thus affording a thoroughly practical and efficientde-? wood-workers, car will be positive;

with the jack.

which will be extremely simple in for divers purposes time inexpensive of production and capable of long life and rough usage.

To attain the desired objects my invention resides in the provision of a jack embodying novel features of construction and combination and arrangement of parts for member 12. detailed construction of my invention may be service, substantially as disclosed herein.

In order that the and arrangement clearly understood and its many advantages be fully appreciated, attention is invited to the accompanying I have illustrated a practical physical embodiment of the best mode I have so far devised for accomplishing the desired objects heretofore set forth, it being understood that I may make such changes, alterations and modifications coming within the spirit and scope of my invention, as circumstances require.

Figure 1 is a perspective view on an en- .largedscale, of the complete jack. Fig. 2 is is provided with a drawings, in which I a vertical section taken between the plunger and standard of Fig. 1, the bracket being removed. Fig. 3 is a perspective view of the jack attached to a single standard and depending from a ladder placed in inclined position against a wall or roof. Fig. 4: is a perspective view of the jack in position upon the upper side of a ladder, the roof plunger being removed. Fig. 5 is a detail view, in section, of the manner of securing the roof plunger clamp upon the jack standard.

In the accompanying drawings, in which similar characters of reference denote corresponding parts in the several views :the Another object of the invention 18 the prowhich will carry an ad-{ numeral 1 designates the standards of an ordinary ladder having the rungs 2, in connection with which ladder I employ my I novel scaffold jack, which comprises a main A further object is to provide an adjllStL-i standard or support 8, having notches i spaced along its lnner'longitudinal edge at 5 passing horizontally therethrough, the purpose of which will be hereinafter explained. The lower end of the standard 3 is provided with blocks 6, carrying hooks 7 adapted to grip over the rungs of the ladder to retain the standard in position thereupon. The upper end of the standard 3 block 8, said block having a strip of metal or other material 9, bent therearound and bolted thereto, said strips forming rope guides, the function of which will be apparent hereinafter.

Pivoted to the standard 3 is the adjustable hook or gripping member 10, which is adapted to be passed partially around and clamped against the side of a single standard 11, or a roof plunger or supporting This hook is provided with an antifriction roller 10, which bears against the face of the plunger 12 and serves to render the movement of the plunger more smooth. The standard 3 is further provided with a longitudinal slot 13 near its upper end, in which blocks 14;, carrying hooks 15 are adapted to work, one of said blocks having a pair of downwardly extending arms 16 in which is journaled a pulley 17, as best shown in Fig. 2.

Pivoted to the inner face of one of the blocks 14 is the inner end of my improved bracket or scaffold support, which comprises an outwardly projecting member 18, having bolted thereto at19, the two inclined brace rods 20 and 21, which deviate therefrom and are secured to the front and rear ends of one of the arms of the yoke 22. The yoke 22 is provided at one end with an opening 23, through which a pin 24 is adapted to be passed and enter the alining openings 25 in the plunger 12. The yoke is also provided with an opening 26 in its other end alining with the corresponding series of openings 5 in the standard 11, through which a pin may be passed, if desired. I mount an antifriction roller 22 in the forward arms of the yoke which acts in con junction with the roller 10 to permit the easy movement of the plunger 12. The yoke 22 is further provided with a smaller yoke 27, secured thereon for engagement with the notches 4 of the standard 3, and between the parallel arms of the yoke I secure the block 28, having the pulley 29 secured there to, over which is passed the hoisting rope or cable 30. This rope 30 is looped around the hook 9 at its upper end and passes downwardly over the pulley 29, thence'upwardly over the pulley 17, and terminates in a looped end 30 which has connected thereto by means of the bail 30*, the having the depending bail 30 to which is connected the snap hook 30". One end of the cable 32 is connected to this hook and the cable extends downwardly over the pulley 31 and back over the pulley 30 to the ground. The function of the rope 30 is to raise and lower the blocks 14, while the cable 32 is used to raise materials to the workman.

By reference to Fig. 3, it will be seen that I have shown the jack applied to the single standard or support 11, heretofore mentioned, said standard having at its upper end the block 33, to which is secured the hook 34, which is adapted to be passed over the rung 2 of the ladder and secure the entire device therefrom. As an additional securing means, the cable or tie rope 35 may be passed around the block and ladder and secured thereto. The lower portion of said block 33 is provided with a metal strip 36, bent in semi-circular shape and secured thereto, thus forming a securing means for the pulley 37, carrying the short rope 38, which is secured to the pulley 39, connected to the upper hook or ring 9 of the block 8. The function of this cable 38 is merely to assist in raising material to the workman. By reason of its pivotal connection with the standard 3, I may swing the clamp 10 around upon its pivot to engage either the roof plunger or the single standard, thus providing a desirable and simple form of clamp.

From the foregoing description, taken in connection with the drawings, the detailed construction and operation of my improvement will be readily. seen and briefly stated pulley 30,

is as follows :The jack proper is first placed upon the ladder with the hooks 7 and 15 engaging the rungs thereof. The scaffold bracket is then raised to the desired height upon the standard 3 through the medium of the blocks 14, slot 13 and hoisting rope 30. lVhcn this position is attained, the small keeper 27 is engaged in the notches of the standard and the bracket secured in place. If the roof plunger is being used, the pin 24 will cause the plunger to move with the bracket, while the rollers 10' and 22' will reduce the friction of the plunger against the clamp and bracket. The function of the roof plunger 12 is to serve as a brace or steadying means when it is desired to perform cornice work and the like.

In Fig. 4, the jack is shown placed upon a ladder inclined against a wall or support and the roof plunger is removed therefrom. By reason of the adjustable feature of the jack, the scaffold will always be on a level parallel with the ground, which is a decided advantage over jacks now in use. It will also be seen that the roof plunger may be adjusted to different height-s for different heights of roofs, and that the jack may be raised or lowered to various levels. It will of course be understood that two jacks and ladders are used, and that the scaffold is supported on the member 18 of the respective brackets.

From the foregoing, it is apparent that I have provided a device of this character which will till a long-felt want among painters, carpenters and the like; and that the device, while capable of use in a number of positions and for various purposes, is entirely safe and practical.

claim 1. The combination with a notched standard, of a bracket consisting of a scafi'old supporting member pivotally secured to said standard at one end, a pair of brace members pivotally mounted on said supporting member at the other end, a yoke the standard, spaced bolts on the yoke pivotally securing the other ends of the brace members, a plunger detach-ably secured to the yoke between the bolts, and means for adjusting the bracket in its angular relation to the standard and for forcing the plunger under the caves of a roof, and means mounted on said yoke engaging the notches in the standard to maintain the bracket and plunger in adjusted position.

2. The combination with a notched standard, of a bracket consisting of a scafiold supporting member pivotally secured to said standard at one end, a pair of brace members pivotally mounted on said supporting member at the other end, a yoke slidable on the standard, means on the yoke for pivotally securing the other ends of the brace members, means for adjusting the bracket slidable on in its angular relation to the standard, and means mounted on said yoke engaging the notches of the standard for maintaining the bracket in adjusted position.

3. The combination With a notched standard, of a bracket associated With the standard, a yoke slidable upon the standard, a plunger detachably secured to the yoke, guiding means for said plunger, means for forcing the plunger under the eaves of a roof, and a bail or yoke pivoted to the slidably mounted yoke and engaging the notches in the standard to maintain the bracket and plunger in adjusted position.

4:. The combination With a notched standard, of a yoke slidable thereon, a plunger detachably secured to the yoke, guiding means for said plunger, means for forcing the plunger under the eaves of a roof, and means mounted on said yoke and engaging the notches in the standard for maintaining the plunger in adjusted position.

5. The combination With a standard, of a bracket adjustable in its angular relation to the standard and consisting of a scaffold supporting member pivotally secured to said standard at one end, a pair of brace members pivotally mounted in said supporting member at the other end, means pivotally securing the other ends of the brace members to the standard, and means for adjusting the bracket in its angular relation to the standard.

In testimony whereof I afiix my signature in presence of tWo Witnesses.

NATHANIEL WILLIAMS.

Witnesses VERN RoWnLL, E1) TRIESS.

Gtpies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0. 

